We look at the division of 10250255 by 855 
We want to figure out the number of times 10250255 can be divided by 855.

Moving on to step 1:
The number 855 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 855

Advancing to step 2:
855 goes into 10 0 times with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 10, we get 10.
Grab the next digit (2) from the dividend, add it to 10, then carry on: 102 / 855

Step 3:
855 can be fit into 102 0 times, resulting in a remainder of 102.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 102 and we're left with 102.
Grab the next digit (5) from the dividend, add it to 102, then carry on: 1025 / 855

On to step 4:
If we divide 1025 by 855, we get 1 and a remainder of 170.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 855 from 1025 to get 170.
Append the next digit (0) from the dividend to 170 and continue with: 1700 / 855

Advancing to step 5:
855 goes into 1700 1 times with a remainder of 845.
The next digit of our result is 1. 
Result so far: 11.0
If we take 855 away from 1700, we end up with 845.
Append the next digit (2) from the dividend to 845 and continue with: 8452 / 855

Going ahead to step 6:
855 can be fit into 8452 9 times, resulting in a remainder of 757.
Use 9 as the next digit of our solution. 
Result so far: 119.0
The remainder is 757 after subtracting 7695 from 8452.
Grab the next digit (5) from the dividend, add it to 757, then carry on: 7575 / 855

Step 7:
855 can be fit into 7575 8 times, resulting in a remainder of 735.
Use 8 as the next digit of our solution. 
Result so far: 1198.0
Subtract 6840 from 7575 to get 735.
Bring next digit (5) of the dividend behind the 735 and repeat the process: 7355 / 855

Advancing to step 8:
855 goes into 7355 8 times with a remainder of 515.
Write down 8 as next digit of the result. 
Result so far: 11988.0
Deduct 6840 from 7355 and we're left with 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5150, and continue the process.

On to step 9:
855 can be fit into 5150 6 times, resulting in a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 11988.6
Subtract 5130 from 5150 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 10:
855 goes into 200 0 times with a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 11988.6
Deduct 0 from 200 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 11:
855 goes into 2000 2 times with a remainder of 290.
Write down 2 as next digit of the result. 
Result so far: 11988.602
Deduct 1710 from 2000 and we're left with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Step 12:
855 goes into 2900 3 times with a remainder of 335.
The number 3 becomes the next digit in our result. 
Result so far: 11988.6023
Subtracting 2565 from 2900 leaves us with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Going ahead to step 13:
855 goes into 3350 3 times with a remainder of 785.
Use 3 as the next digit of our solution. 
Result so far: 11988.60233
Subtract 2565 from 3350 to get 785.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7850, and continue the process.

After the division, we end up with 11988.60233 and a remainder of 0.000785.